Investigators have a Hollywood murder mystery on their hands involving the deaths of "Sons of Anarchy" actor Johnny Lewis and an elderly woman Wednesday.

The 28-year-old actor, who also appeared in “The O.C.” and “Criminal Minds,” died after falling off a three-story home in the Los Feliz neighborhood of Los Angeles, California, near Griffith Park, police said Thursday.

Police responded to a call from neighbors who said they heard screams from a woman inside a house. Police found Katherine Davis, 81, dead. A police spokesperson called it a "gruesome scene."

"It appears that some type of altercation occurred inside the house, resulting in the death of the woman, then this individual ran outside and had an altercation with a couple of neighbors," LAPD Commander Andrew Smith told reporters.

Police refused to comment on whether drugs might have played a role in the incident.

Los Angeles County Coroner's Lt. Larry Dietz said autopsies will be conducted Thursday.